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Upgrading to a 24MHz crystal
Pete Schwamb edited this page Jan 16, 2016
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This applies to boards made with a 26MHz crystal. Any board made before Oct 6th, 2015 will have a 26MHz crystal unless it was upgraded. You can verify the crystal on your board if you want. It's a silver rectangular part in the center of the board, and will have a 26.00 etched into the top. You'll probably need a strong light, and a magnifying glass to read it. Upgraded boards have a crystal that has 24.00 on the top.
Here are the new parts you will need:
- (two of these) CAP CER 12PF 50V NP0 0402 (Digikey part # 490-5924-1-ND)
- (one of these) CRYSTAL 24.0000MHZ 8PF SMD (Digikey part # 644-1052-1-ND)
To replace the crystal with a rework station that has a pre-heater, I perform the following steps:
- Warm the board to 150°C using the pre-heater.
- Using the hot air gun set to 220°C, slowly heat the crystal and capacitors from above, bringing the nozzle closer until you see the solder liquify.
- While the solder is still liquid, remove the crystal, and associated capacitors from the board with tweezers, and discard them.
- Let the board cool back down to 150°
- Apply a very small amount of new solder paste to the exposed pads from where you removed parts.
- Place the new 24 MHz crystal and two 12pF capacitors.
- Using the air gun again, heat the components until they fuse with the solder.
- Let it cool down (not too fast).
- Before plugging in the battery, verify there is no short in the power system, by testing connectivity between the two terminals coming out of the back of the battery plug.
- Connect the battery, and try charging with a USB cable. The red light should come on, unless the battery is fully charged (rare).
- Flash both the cc1110 and the ble113 with the latest firmware. Remember to not run the cc1110 flash when connected to the ble113, or you will erase the key on the ble113.
- Using the RileyLink app make sure you can communicate with a pump: RileyLink -> Select a RL -> Pump Chat -> Query Pump Model. Verify that you get the model, and that the light comes on the pump.